So I kinda need help

So my bf and I have been dating for about three months or so and its been difficult. His parents are very strict and always ground, he can never hang out. But were getting through it until summer and school is over. So im not gonna use their actual names so im gonna use the names megan, me, ty, and will. So megan is my best friend and ty is my boyfriend. Will likes Megan. We have a group chat and we call almost every night. Me and ty have been arguing a lot lately. Megan has been there for me through it. So tonight maybe im being dramatic or overthinking but ive noticed tonight that Ty and Megan have been getting extra close and have been talking a lot more. Ty and is being super rude towards me and he keeps talking to Megan. Megan really isnt doing anything except when he left the call for a second he came back and she was like awwww hes back. So Ty keeps talking to her and his voice keeps changing and talking to her and they keep laughing. Shes giving him a back up phone and they keep talking about that but anytime I try to talk hes like stfu. Then hes siding with her and things. Its really starting to bother me and stressing me out. I might be over reacting but thats what you guys are for so ill give updates with what happens but any suggestions? should I ask him or her?

update: so I talked to them some more and hes just being so mean to me. She keeps trying to embarress me and they wont stop talking to each other.